Electric switch



2 SHEETS-SHEET I.

F. B. COOK.

ELECTRIC SWITCH.

APPLICATION FILED IAN. 15. T915. 1,198,239. Patented Aug. 1, 19115.

F. B. COOK.

ELCTHIC SWITCH. APPLICAHON min MN.15.19s5.

.,-whi'ch'the following isa. full,

FRANK B.4 Coole-OF CHIcAGOiqgiLINOIs, AssIG'Non 'ro FRANK' B. COOK COMYANY, or

Y CHIQAGQQILiffItIs, A CORPORATION Or ILLINOIS.-

Application tiled January 15, Serial No. f2,422..l

57'@ ell f'ioliom'it moy concern :A

Tie it'kno v'n that L'FRA'NK B. Coon, citi- States, residing at Chiciigo,"in' Athe countyV `of` Cook vand YState of "Illinoishave, invented a certain new and :useful In'ipro'vementin Eleiitric Switches,o'f

p clear, concise, and exuctdescription, reference being had to the `acc on'epanying drawings, forming a showing the' preferred par-t of Vthis specification` iVy invention` relates to electric switches employing eomplemental parts in the formA of s )ring jacks'and conductingY plugs.

'.l ie inventionhas for one of its objects such. fr construction of these two complenjiental parts of a switch that' the -thimbles n"o ther .third spring jack contacts :Lt-the frontthereo will notbeadapted to have siinultneous engngement with any two conf wh'erebythe plug contacts. will be limited to engagement with the-con-x tacts of the plu g tncts vofthe jnelt to which the p lu'g contacts are coilbltflllental. l

'The ,inventigm-lnts for another fof its objectsthe im proved fornnitionof .spring jacks and for another of its objects the' 'ixnproved fornniti in of 4spring jack engaging plugs, all as willfclearly appear from thelfollowing descriptionnnd claims. v

I will explain my invention more fully by reference tothe accompanying drnivings einbodin'lent thereof and in which-f Figure ljis a View with the plug portion of. the switch in. elevation and 'a part of '.l"ig.3 is a sectional view on line: 3 3 of Fig. "3; Fig. 4 is a sec- 't-ionalryiew 'on line 4.4 of Fig. 2; Fig. 5 is -a seet'ionaltview on line 5' 5 ot Fig.- 2;

[line 2'of Fig.

lFig. is aplan view, on a smaller scale, of

a 'sinigll group of Jacks; l"1g. 7 is --f'a part of the striieturc 'of l ig.(v;

ingone of the j K .liilte parts are indicated by similar char- Speettlciatloii Off Letters Peten@ Patented-Aug. 1, 1916.;

actors of reference throughout the different 'l figures l A strip l of; insulation of a lengtlineorrespending to the number (if spring ieclgstoI be mounted is provided with a front mill 1n which the thimbles 3 or other-"third jack contacts are disposed, the bores of the thimbles snugly receiving the forward continuation of the plug or third Contact portion 4. The end portions ofthe strip 1 are desirably of the same height nndarefalined with the ruil 2. The portion ofthe strip to the'rear of the rail and between the ends thereof is preferably thinner thanthe` rail and 'is de. sirably disposed intermediate the/,top land bottom planes ofl the rail.V lhisfinterme-- diate portion of the .strip is provided'withV recesses 5 which are :dined `Vith theaxes of ythe thimbles 3, these recesses extendingvfroin ,1, vin the process of manufacture, originally jean-ries onlythe thimb-les Bend the condncf tors (i extendingrearwardly from thesethimbles, the forward ends of the conductors (l being of bifnrcated -or fork-shaped formation with .-branchesthat correspond gener ally in shape to the openings 5 -and 'the for-l ward ends'of which-'branches are engaged to have extendedsoldered, braz'ed or .weldedpA connection with their thimbles as' indicated in Figs. '2 :rnd 121 Thus cach thirnble is interposed between and is electrically connected with the two forward branches of its conductor (i. All parts of eachcon'ductor (l, excepting its rear end, ii'icluding its bi- 'furcations and together with the thinibles 3 ure preferably nmldedwithin th'e mountinpr strip l and its forward'portion 2.

The tn-lkingeontact'springs 7 and 8 are mounted upon the top and bottom sides of thestrip i et the rear e'nd thereof and normally rest `upon projections 9, 10, the projertirms l) being separated longitudinally of the strip as are the projections l0 to reduce.

leakage between springs of dadpn-,ent jacks, these projections or ,ridges 19" and l10 upon each side of the strip being also' desirably separated \\-'i ,lth\\'ise of the strip to reduce "the amount of insulating material required. Said projections nre preferably integrally formed with the Strip of insulating materiel.

'1 that carries them. The forward ridges 'or projections 10 also constitute.= back stops against .i liich the springs i' and S are forced h v their own resilience .indwhi-'sh limit thel extent to which these springsinay.approach eachother, l desirallv forni the jack structure b v suitably position-ing the Asprings 7 and S within a molding machine with theii' openings 11 in alinen'ient with previouslyV formed openings 12 at the rear-of the strip 1, through which openings molding materialls forced wheirit is operated upon by the molding machine to'toifmi the top and bottoin binding-'strips lil between which and the strip 1 the rear ends ofthecontact.

springs 7 and'S are disposed. Thus these Y springs iv and S are held upon vthereaif' ot the contact strip l by the strips 13 by means ot bridge connections or rivetportions 14 that pass through the openings-1l in the springs 7 and S and through'corresliondinf'lypositioned openings 12 at the rear ot the strip 1. 'lhe strips 1?` in 'extending longitudinally of the strip 1. ai'e connected as fre ipiently by the bridge poi-tions 14 as there. are. openings 1t and4 corresponding openings 1:5 in the stripl \\"fhereli v the strip's 13 are held in` intimate clamping engagement.l

with the contact; springs. in other words each strip l?! constitutes Y a eou'iposlte rivet head common to a iluralitv of rivet Shanks 14 that pass through alined openings 11 and 12. The rear of the -strip A1 isV provided 'it h'shallow grooves 15in the-top and hottoin of the strip'aiid whose 'longitudinal' borders are engaged by the springs Tand S and between which borders the holes l2 are disposed, these channels serving to receive apart of the molding material olY which the Strips 13 are n'iade wher-eli) these l.strips are.-

prcvented from moving crosswisc of the main strip 1` inthe evenl that the bridge .portions 14 should not lie sullif-ientlv ellective. in preventing all relative movement between tht'i'strips lil and 1;l The grooves 15 arewlesiralily rectangular in formation so that the parts olA the strip 12S received therein will he socngaged thereby as to befunr`espoiisive to turning eti'ort arising when the springs 7 and t# are spread apart by iiiserted plugs. \\"liile,l prefcrto mount the conductor '6 within the strip l in the man'.-

iier described l do not wishto be, limited to' .such a disposition oftliese conductors in all' einhmlinients of the invention.

'lhe forward rail .5 of the. strip lconsti! ntutes a face portion Aot" :iswitch boa rd .strueture and projects sullicientlv t'oiwa rd of the thirdrjack contacts 5 to prev-ent these third jack contacts from directly connecting any contact portions ofthe plug' that; isin the process of insertion` the holes in the strip rail L which receives the lliirnliles beingr de,- siralily conlracted at thiI l'roii't tace of the. rail to equal the hores ol" the tliiinbles in diameter. The result is that. noangular porail 2 aiiil thiinhles $5 that'said'thimbles are. incapable of having simultaneous connection with any two plug contacts.

The contact portion t is generally*tubular but is desirably cutaway atan intermediate portion to alford access'to its vinterior at points where connectionsare to be made with the contacting or'other strands ofthe cord circuit ot whichjthe plug forms a part.

'1`heforward end of the horei'ot' the" tubular i conductor l is tilled with insulation lcS which.

is continued rearn'ardlv ot' the points of attaclunent of the aforesaid cord strands where theilling'ot' insulatingr material maiy support short threaded nuts lh vandlt) into which binding screws '1 mayhe threaded to clamp the'cord conductorsl '2 in phif the third vconducting cord 'being'electrically vconnected with the heel contact l in 'a well known manner., 'lhe terminal nuts` 14)' and l lwhich'are soldered or otherwise liavecon-- uectiou willi the ring andtip. Themlding insulatingr material istorced into thel Space iii Athe tubular element -l in whichutliegeonductors 33 and 24 arefpreviously disposed and in order to prevent tlieflowingA insulating material from bringingtheseveohduetors into direct contact .with each 'other `or with other metallic portions of the plug` that should be'insiilated tlierefrouil employinsiilat ion about the conductors lh '24" which is preferably in the form 1of enamel bjutivhich these insulated conductors are preferably -sepa ra-tely formed from the plug contacts to which they exteridl donot-wislhto be limited to this characteristie since the insulation thereof not only enables me to -pjractise 'the method of m latter copendingt-` application. but prevents iuulesirahle contaetix of these' conductors 'iu the event of injury-ot; deterioi'atioii. i

20 are respectivel)` crunected withthe ring' While l have shown a sp'ringiaCk.lutvingf i three contact portions` iiiid'aplug ha 'ing three couipleniental contact' i'ior'ti'i'inS- Itlo not wish to be limited to the number of eoi- 1 tact portions employed in these comples mental eteineiits of f in v improved switcch structure. I c

Claims'relating,r .toi the plug;r are included in my (io-pending applieation Serial No. 103102. filed June ,lt

Having thus lrwrihed my invention I elaiux aS ne and desire to refaire hy Letters Patent the foliowingf l. A spring jaek strueture inrluding a mounting strip of insulation haring a pluraiity of ,plug reeeiving openings4 at its tor ward portion and provided with openings therethrough located along the niountisa.; strip; eontaet; springe supported hg; the mounting strip; and a fastening strip of insulation for holding the springs and mounting strip togetl'ier. said fastening strip having integral eontinuations thereof whieh pass through the aforesaid openir-igs in tho mounting strip to .seeure the aseenihlj; of `said fitrips'.

i?. A spring jaek strueture ineluding a mountingy strip of insulation having i pluraliti.' oi' plug receiving openings at its for-- *Ward portion and provided with openings` tfu'rethrough loeated alon;` 'he mounting strip; eonta'et spring, supported he the mountingy @trip upon eaf'h side thereof: and a fauteuil .strip oi" ins "tion upon Side of the mountinL'ir trfp for holding; tf, spi-in z and mounting drip fog-diri', mid fast: nn# strip having' fmitinaaiion-`y emi; integra? with luth and which pasy though the aforesaid openings in the mounting strip to seein-e the asseinhlv of said strips.

3. A spring jack strueture ineludingi; a mounting strip of insulation having a plu lnlity of plug reeeiving openings :it its` forward portion and provided with open ings theretl'irongh located along the mount ing strip; eontaet springs supported h v the mounting strip; and a fastening strip of insulation for holding the springs and mounting strip together` .said fastening strip having integral continnations thereof whieh pass through the aforeiaid openings in the mounting strip to sei-ure the assenihly of Q i ias-erung .strips said strips. the eontaet springs having openings in alineineut with the aforesaid openings in the mounting @trip through u' i the aforesaid eontinuatimis also pass,

4. A spring piek etrueture ineluding a mounting strip of insulation having a plu ralitv of plug rewriting openings at its forn ward portion and provided with openings' therethrough located along the mounting Strip; contaery springs supported hv tne mounting strip upon each side thereof; and a fastening strip of insulation upon eaeh side of the mounting strip for holdingr the springs and mounting strip togetlwr`r said fastening strips haring eontinuations each integral .'Jith hoth fattening strips and which pass through the aforesaid openings in the mounting strip to Secure the assemhly of said strips, the eontaet springs having openings in alinement with the aforesaid openings in the mounting strip through whioh. the aforesaid eontinuations also pass.

J3. spring jack strueture including;r a .'nounting strip of insulation having a pluralitiY of plug reeeiring openings at its forward portion and provided with openings therethrough loeated along the mounting strip; eontaiely springs supported hy the mounting strip; and a fastening strip of insulation for holding the springs and mounting strip together. said fastening strip having integral eontinuations thereof whieh pasa through the aforesaid openinefs` in the mounting strip to oeeure the assemhly oi' 'said strips. thil mountingr strip heing angularli elianneled longitluliuall'i' thereof wherel th* aforisaid opening`v therein are provided also to reeeive the material of the fastening Strips A f3. A spring Miafli .strutture ineludlntf a mounting strip of insulation having a p|u ralitj.Y oi' plug rer-uiting openings at its forward portion and provided with openings therethrough loeated along the mounting strip: routaet springs .supported h v the uaozntiugstrip upon eaeh side thereof: and a i`astening strip ot' insulation upon. eaeh side ot the mounting strip for holding tiay Springs and inountin r strip together. .said fusti-ning stripsharing eontinuations integral with hotli fastening Strips and uhieh pass through they aforesaid openings in the mounting strip to serure the assemhlv of said strips. the` mounting :strip heilig angularlv elianneled longitudinally thereof here the aforesaid openings therein are provided also to reeeive the material ofthe faste-ning strips.

T. A spring iaek strueture ineluding a mounting strip ot' insulation having a plurality of plug rereiving openings at its forward portion and provided with openings therethrough located along the mounting strip; eontaetI .springs supported hy the mounting strip; and a fastening strip of insulation for holding the springs and mounting Strip together. said fastening strip having integral rontinuations thereof which pass tlwough the aforesaid openings in the mounting strip to seeure the assenihly of Said ,trips` the eontaet springs ha ving openings in alinenient with the aforesaid openings in the mounting strip through which the aforesaid eontinuations also pass. the mounting strip heing angularly channeled longitudinally thereof Where the aforesaid openings therein are provided also to reeeive, the material ofthe fastening strip.

R. A spring jaek strut-ture including a mounting strip of insulation having a plurality of plug reeeiring openings at its fon ward portion and provided with openings therethrough lo :ated along the mounting strip; Contact springs supported by the mounting strip upon each side thereof; and

noleri longituuinany thereof when-u the aforesaid openings therein aro provided also to rereive the? material of the fastening 15 Strips. w in witness whereof, I hereunto snbu-riho in): name this nihh day of January7 A. i).

FRAN K B. COUT( in i 

